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Nickname for his model: Plum Pudding Model (or Raisin Bread Model) Description of his model: Thomsonâs model was known as the Plum Pudding Modelâ (or Raisin Bread Model.) As each atom was a sphere filled with a positively charged fluid, known as the âpuddingâ. Scattered in this fluid were negatively charged electrons, these were the âplumsâ in the pudding.
A particularly useful mathematics problem related to the plum pudding model is the optimal distribution of equal point charges on a unit sphere called the Thomson problem. The Thomson problem is a natural consequence of the plum pudding model in the absence of its uniform positive background charge. The classical electrostatic treatment of electrons confined to spherical quantum dots is also similar to their treatment in the plum pudding model.